Ключевые слова: aerial, against, aircraft, background, ball, balls, big, blue, bright, cable, city, clouds, color, colored, coloured, cross, electric, electricity, engineering, flying, hang, helicopter, high, illustration, industrial, industry, isolated, line, lines, low, marker, nature, orange, overhead, pilot, power, red, safety, sky, skyline, skyscape, technology, transmission, visibility, visual, voltage, wallpaper, warning, white, wire,